The letter, which included signatures from the mayors of L.A., New York City, San Francisco and Salt Lake City, was written to Speaker of the House John Boehner and House Minority Leader Nancy Pelosi out of concern for proposed cuts to the SNAP program.

While urging lawmakers to preserve funding, the mayors also wrote:

"We also believe the program can do more to address the pressing challenge of obesity and diet-related disease ... It is time to testand evaluate approaches limiting SNAP’s subsidization of products, such as sugar-sweetened beverages,that are contributing to obesity."